mt76: mt7915: fix calling mt76_wcid_alloc with incorrect parameter

It will cause maximum connectable STA to be one less
when calling mt76_wcid_alloc with parameter MT7915_WTBL_STA - 1.

Signed-off-by: Bo Jiao <Bo.Jiao@mediatek.com>
Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
Reviewed-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/init.c

@@ -480,7 +480,7 @@ static int mt7915_init_hardware(struct mt7915_dev *dev)
 	}
 
 	/* Beacon and mgmt frames should occupy wcid 0 */
-	idx = mt76_wcid_alloc(dev->mt76.wcid_mask, MT7915_WTBL_STA - 1);
+	idx = mt76_wcid_alloc(dev->mt76.wcid_mask, MT7915_WTBL_STA);
 	if (idx)
 		return -ENOSPC;
 

drivers/net/wireless/mediatek/mt76/mt7915/main.c

@@ -613,7 +613,7 @@ int mt7915_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 	struct mt7915_vif *mvif = (struct mt7915_vif *)vif->drv_priv;
 	int ret, idx;
 
-	idx = mt76_wcid_alloc(dev->mt76.wcid_mask, MT7915_WTBL_STA - 1);
+	idx = mt76_wcid_alloc(dev->mt76.wcid_mask, MT7915_WTBL_STA);
 	if (idx < 0)
 		return -ENOSPC;